The Sharp MD-DK301 was released around 2004 according to History of portable MiniDisc & Blanks. It has Sharps 1-BIT Technology, which according to Sharp, “gives 1-bit unrivaled time accuracy and resolution, resulting in a faithful reproduction of the original sound.”
Not much else is known as of the time of this article.
Content adapted from: History of portable MiniDisc & Blanks
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